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REVENUE RECOGNITION - Summary of Significant Changes in Unbilled Receivables and Deferred Liabilities Balances (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Deferred Revenue (Increase) Decrease |  |
Balance at December 31, 2020 | $ (162,301) | $ (144,862)
Revenue recognized that was previously included in deferred revenue | 33,439 | 38,749
Increases due to cash received | (53,000) | (43,685)
Cumulative catch-up adjustment arising from changes in estimates of transaction price | 3,738 | 367
Net change | (15,823) | (4,569)
Balance at March 31, 2021 | (178,124) | (149,431)
Unbilled Receivables Increase (Decrease) |  |
Balance at December 31, 2020 | 10,429 | 1,362
Unbilled receivables recognized | 20,471 | 1,395
Transferred to receivables from unbilled receivables | (6,000) |
Net change | 14,471 | 1,395
Balance at March 31, 2021 | $ 24,900 | $ 2,757

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